     body {
            font-family: Arial, sans-serif;
            background-color: #f5f5f5;
            text-align: center;
            padding: 20px;
        }

        .container {
            max-width: 600px;
            margin: 0 auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            border-radius: 15px;
        }

        h1 {
            color: #333;
            margin-bottom: 20px;
        }

        .reward-options {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 30px;
        }

        .reward-image {
            width: 80px;
            height: 100px;
            cursor: pointer;
            opacity: 0.6;
            transition: opacity 0.3s;
            image-rendering: pixelated; /* 防止图片缩放时失真 */
        }

        .reward-image:hover {
            opacity: 1;
        }

        .reward-image.active {
            opacity: 1;
            border: 2px solid #007BFF;
            border-radius: 10px;
        }

        .reward-details {
            text-align: center;
        }

        .qr-code {
            width: 260px;
            height: 360px; 
            margin-top: 10px;
    border: 4px solid #007BFF; 
            padding: 10px;
            background-color: #fff;
            image-rendering: pixelated; /* 防止二维码缩放时失真 */
            border-radius: 50px;
        }